package main

import "fmt"

func main() {
	a := 100
	fmt.Printf("a = %d\n",a)
	{
		a := 1001
		fmt.Printf("a = %d\n",a)
	}
	fmt.Printf("a = %d\n",a)
	
	a = 200
	fmt.Printf("a = %d\n",a)
}